3D Graphics Using OpenGL ES 2.0 - Beginning Android 3D Game Development - page 93

Program Flow Control Statements
The important program flow control statements for the OpenGL ES 2.0 shader language follow.
for loop: To use a for loop, initialize the counter value before starting the loop;
execute the loop, if the expression evaluates to true; at the end of the loop, update
the counter value; and repeat the loop, if the expression in the for loop evaluates
to true.
for(Initial counter value;
Expression to be evaluated;
Counter increment/decrement value)
{
// Statements to be executed.
}
while loop: Execute the statements in the while loop, as long as the expression to
be evaluated is true.
while( Expression to evaluate )
{
// Statement to be executed
}
if statement: If the expression evaluates to true, then the statements within the if
block are executed.
if (Expression to evaluate )
{
// Statements to execute
}
if else statement: Execute the statements in the if block; if expression evaluates
to true else , execute the statements in the else block.
if (Expression to evaluate)
{
// Statement to execute if expression is true
}
else
{
// Statement to execute if expression is false
}